Arthur Plantagenet, 1st Viscount Lisle, KG (died 3 March 1542) was an illegitimate son of King Edward IV, half-brother of Queen Elizabeth of York, and thus an uncle of King Henry VIII, at whose court he was a prominent figure and by whom he was appointed Lord Deputy of Calais (1533–40). The survival of a large collection of his correspondence in the Lisle Letters makes his life one of the best-documented of his era.